<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #Arrow {
            width: 50px;
            height: 50px;
            border-left: 50px solid transparent;
            border-right: 50px solid transparent;
            border-top: 50px solid #fff;
            /* float: left; */
            /* transition: 0.5s; */
            /* -moz-transition: -moz-transform 0.5s; */
            /* Firefox 4 */
            /* -webkit-transition: -webkit-transform 0.5s; */
            /* Safari and Chrome */
            /* -o-transition: -o-transform 0.5s; */
            /* Opera */
            background-color: red;
        }

        #Arrow:hover #Arrow {
            -moz-transform: rotateZ(180deg);
            -webkit-transform: rotateZ(180deg);
            -o-transform: rotateZ(180deg);
            transform: rotateZ(180deg);
            filter: FlipV;
        }
    </style>
</head>

<body>
    <div id="Arrow"></div>
    <script>

    </script>
</body>

</html>